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Journal articles
Water-based adhesive penetration into paperboard and coated paperboard, TAPPI Journal January 2025
The setting of water-based adhesives in contact with paperboard is important in the production of boxes and other packaging, but the topic has received little attention in the literature. The penetration of the adhesive into the paper surface is important to get good bond strength through mechanical interlocking. The influence of the process conditions and the paper properties on this penetration is lacking. A water-based adhesive was applied to an uncoated and coated paperboard. The coating layer had two latex levels. Samples were characterized in terms of air permeability, void fraction, average pore size, and coat weight. The adhesive was applied to the samples in a mechanical press, squeezing a drop between two samples. The penetration of the adhesive was characterized with a silicone oil absorption method that measured the decrease in pore volume after the adhesive had been applied to approximate the pore volume taken up by the adhesive. The bond strength was measured with a peeling test. The penetration depth into uncoated paper did not depend on the application method parameters such as pressing time, pressure, or initial solids of the adhesive. The penetration depth ranged from 35•40 mm. The penetration into 10 pph latex content coated paper was similar to the uncoated samples, but reduced penetration was observed into the 40 pph latex content coatings. The results were compared to the limiting amount of adhesive that was obtained from the weight gain of the samples and to a simple model that is based on flow in porous media. Peel tests revealed that good penetration was needed, as well as a strong coating layer to obtain high peel forces.
Journal articles
Comparison of the application of polysaccharide-based barrier coatings on paper using film press and spray coating, TAPPI Journal January 2025
The growing demand for sustainable packaging has spurred research into biopolymer-based solutions and their application to paper substrates. This study compares the application of low solids, high viscous aqueous solutions of alginate and chitosan on two different paper substrates using a laboratory film press coater and a purpose-built spray coating unit, with a focus on barrier performance and practical industry considerations. Key parameters investigated are air flow rate, water vapor transmission rate, and grease resistance. Results showed that due to the low solids content of the applied biopolymer solutions, film press coating required a double-layer application for coat weights exceeding 4 g/m², making it less viable for industrial application. In contrast, spray coating allowed for higher application weights in a single step. The barrier properties of spray coated samples, compared to film press coatings, varied with the paper substrate: spray coating performed better on one substrate and worse on the other. Contact angle measurement of the substrates suggested that spray coating is more suitable for a more hydrophilic substrate because of improved surface wetting. The study also identified issues with drying conditions and pinholes affecting the quality of spray coated samples, indicating a need for further research to optimize these parameters.
Journal articles
Editorial: Fundamental understanding enables new coating opportunities, TAPPI Journal January 2025
TAPPI's Coating, Printing, and Surface Enhancement (CPSE) Division pursues open exchange of technical information related to materials, equipment, and processes for the manufacture, quality control, and use of coated papers, paperboard, and other substrates. Much of this technical information is presented at sponsored conferences, including TAPPICon and the Advanced Coating Symposium. Based on feedback from these events, TAPPI Journal peer reviews the research from these events that adds significant value to the scientific community. In last year's November issue, we presented five peer-reviewed manuscripts based on presentations given at TAPPICon 2024.
Books
TAPPI News
Master Papermaking Additives to Gain Competitive Advantage and Better Meet Customers’ Needs
Make Paper Products Stand Out: Strategic Use of Wet End Chemical Additives Now Available From TAPPI Press
TAPPI News
An Accent on Innovation
An Accent on Innovation On May 13, 2014, Eric Fletty and I had the opportunity to visit with one of TAPPI’s Sustaining Member companies, Kadant Inc., at its Kadant Johnson facility in Three Rivers,
TAPPI News
If you Mess it Up, Un-Mess It!
If you Mess it Up, Un-Mess It! "If you mess it up, un-mess it."...Fred von Zueben, retired, CEO, The Newark Group I was with The Newark Group 10 years prior to coming on board with TAPPI. One of the
TAPPI News
What a whirlwind in September and October 2016 Volume 1
What a whirlwind in September and October 2016 Volume 1 My travels began with an invitation to be a Keynote speaker at the 27th Pulp and Paper Reliability & Maintenance Conference at IDCON, INC. The
TAPPI News
One of a Kind CEO, one of a Kind Company
One of a Kind CEO, one of a Kind Company Recently a politician made a statement during a campaign speech: "Corporations are not people, people are people." I wish to respectively submit that this
TAPPI News
The Year of the Dragon - Part 2: APRIL in May
The Year of the Dragon - Part 2: APRIL in May This past May 31, I had the distinct pleasure of meeting with personnel from APRIL's pulp mill in Rizhao, Shandong Province, China. First Impressions.
Journal articles
Comparative annual cost efficiency between thermal and chemical oxidation of TRS in kraft mills, TAPPI JOURNAL, July 2005, Vol. 4(7) (200 KB)
Comparative annual cost efficiency between thermal and chemical oxidation of TRS in kraft mills, TAPPI JOURNAL, July 2005, Vol. 4(7) (200 KB)